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            webpack进阶篇（二十二）：Scope Hoisting使用和原理分析
          </h1> <div class="theme-vdoing-content content__default"><h2 id="说明"><a href="#说明" class="header-anchor">#</a> 说明</h2> <blockquote><p><code>玩转webpack</code>课程学习笔记。</p></blockquote> <h2 id="现象-构建后的代码存在大量闭包代码"><a href="#现象-构建后的代码存在大量闭包代码" class="header-anchor">#</a> 现象：构建后的代码存在大量闭包代码</h2> <p><img src="https://img-blog.csdnimg.cn/20200706013211926.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2thaW1vMzEz,size_16,color_FFFFFF,t_70" alt="70201"></p> <h2 id="会导致什么问题"><a href="#会导致什么问题" class="header-anchor">#</a> 会导致什么问题</h2> <ul><li>⼤量作用域包裹代码，导致体积增大（模块越多越明显）</li> <li>运行代码时创建的函数作⽤域变多，内存开销变大</li></ul> <h2 id="模块转换分析"><a href="#模块转换分析" class="header-anchor">#</a> 模块转换分析</h2> <p><img src="https://img-blog.csdnimg.cn/20200706013232704.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2thaW1vMzEz,size_16,color_FFFFFF,t_70" alt="70202"></p> <p>结论：</p> <ul><li>被 webpack 转换后的模块会带上一层包裹</li> <li>import 会被转换成 <code>__webpack_require</code></li></ul> <h2 id="进一步分析-webpack-的模块机制"><a href="#进一步分析-webpack-的模块机制" class="header-anchor">#</a> 进⼀步分析 webpack 的模块机制</h2> <p><img src="https://img-blog.csdnimg.cn/20200706013252977.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2thaW1vMzEz,size_16,color_FFFFFF,t_70" alt="70203"></p> <p>分析：</p> <ul><li>打包出来的是⼀个 <code>IIFE</code> (匿名闭包)</li> <li><code>modules</code> 是⼀个数组，每⼀项是⼀个模块初始化函数</li> <li><code>__webpack_require</code> ⽤来加载模块，返回 <code>module.exports</code></li> <li>通过 <code>WEBPACK_REQUIRE_METHOD(0)</code> 启动程序</li></ul> <h2 id="scope-hoisting-原理"><a href="#scope-hoisting-原理" class="header-anchor">#</a> scope hoisting 原理</h2> <p><strong>原理</strong>：将所有模块的代码按照引用顺序放在⼀个函数作用域里，然后适当的重命名⼀些变量以防止变量名冲突。</p> <p>对比: 通过 <code>scope hoisting</code> 可以减少函数声明代码和内存开销</p> <p><img src="https://img-blog.csdnimg.cn/20200706013325745.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2thaW1vMzEz,size_16,color_FFFFFF,t_70" alt="70204"></p> <h2 id="scope-hoisting-使用"><a href="#scope-hoisting-使用" class="header-anchor">#</a> scope hoisting 使用</h2> <p>webpack mode 为 <code>production</code> 默认开启</p> <p>必须是 ES6 语法（静态分析），CJS 不⽀持（动态）</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code>module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
  entry<span class="token operator">:</span> <span class="token punctuation">{</span>
    app<span class="token operator">:</span> <span class="token string">'./src/app.js'</span><span class="token punctuation">,</span>
    search<span class="token operator">:</span> <span class="token string">'./src/search.js'</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  output<span class="token operator">:</span> <span class="token punctuation">{</span>
    filename<span class="token operator">:</span> <span class="token string">'[name][chunkhash:8].js'</span><span class="token punctuation">,</span>
    path<span class="token operator">:</span> __dirname <span class="token operator">+</span> <span class="token string">'/dist'</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  plugins<span class="token operator">:</span> <span class="token punctuation">[</span>
    <span class="token comment">// webpack3需要添加这个</span>
    <span class="token keyword">new</span> <span class="token class-name">webpack<span class="token punctuation">.</span>optimize<span class="token punctuation">.</span>ModuleConcatenationPlugin</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br></div></div><h2 id="例子"><a href="#例子" class="header-anchor">#</a> 例子</h2> <p>1、先将mode设置成none，在打包看看index.js</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">/******/</span> <span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">modules</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// webpackBootstrap</span>
<span class="token comment">/******/</span> 	<span class="token comment">// install a JSONP callback for chunk loading</span>
<span class="token comment">/******/</span> 	<span class="token keyword">function</span> <span class="token function">webpackJsonpCallback</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 		<span class="token keyword">var</span> chunkIds <span class="token operator">=</span> data<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 		<span class="token keyword">var</span> moreModules <span class="token operator">=</span> data<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 		<span class="token keyword">var</span> executeModules <span class="token operator">=</span> data<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token comment">/******/</span> 			chunkId <span class="token operator">=</span> chunkIds<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token comment">/******/</span> 			installedChunks<span class="token punctuation">[</span>chunkId<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 		<span class="token punctuation">}</span>
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<span class="token comment">/******/</span> 			<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">hasOwnProperty</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>moreModules<span class="token punctuation">,</span> moduleId<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 		<span class="token keyword">while</span><span class="token punctuation">(</span>resolves<span class="token punctuation">.</span>length<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 			resolves<span class="token punctuation">.</span><span class="token function">shift</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">/******/</span> 		<span class="token comment">// add entry modules from loaded chunk to deferred list</span>
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<span class="token comment">/******/</span> 		<span class="token comment">// run deferred modules when all chunks ready</span>
<span class="token comment">/******/</span> 		<span class="token keyword">return</span> <span class="token function">checkDeferredModules</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">/******/</span> 	<span class="token keyword">function</span> <span class="token function">checkDeferredModules</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">/******/</span> 				<span class="token keyword">if</span><span class="token punctuation">(</span>installedChunks<span class="token punctuation">[</span>depId<span class="token punctuation">]</span> <span class="token operator">!==</span> <span class="token number">0</span><span class="token punctuation">)</span> fulfilled <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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<span class="token keyword">function</span> <span class="token function">helloWebpck</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token string">'Hello Webpack!'</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token comment">/***/</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token comment">/******/</span> <span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br><span class="line-number">89</span><br><span class="line-number">90</span><br><span class="line-number">91</span><br><span class="line-number">92</span><br><span class="line-number">93</span><br><span class="line-number">94</span><br><span class="line-number">95</span><br><span class="line-number">96</span><br><span class="line-number">97</span><br><span class="line-number">98</span><br><span class="line-number">99</span><br><span class="line-number">100</span><br><span class="line-number">101</span><br><span class="line-number">102</span><br><span class="line-number">103</span><br><span class="line-number">104</span><br><span class="line-number">105</span><br><span class="line-number">106</span><br><span class="line-number">107</span><br><span class="line-number">108</span><br><span class="line-number">109</span><br><span class="line-number">110</span><br><span class="line-number">111</span><br><span class="line-number">112</span><br><span class="line-number">113</span><br><span class="line-number">114</span><br><span class="line-number">115</span><br><span class="line-number">116</span><br><span class="line-number">117</span><br><span class="line-number">118</span><br><span class="line-number">119</span><br><span class="line-number">120</span><br><span class="line-number">121</span><br><span class="line-number">122</span><br><span class="line-number">123</span><br><span class="line-number">124</span><br><span class="line-number">125</span><br><span class="line-number">126</span><br><span class="line-number">127</span><br><span class="line-number">128</span><br><span class="line-number">129</span><br><span class="line-number">130</span><br><span class="line-number">131</span><br><span class="line-number">132</span><br><span class="line-number">133</span><br><span class="line-number">134</span><br><span class="line-number">135</span><br><span class="line-number">136</span><br><span class="line-number">137</span><br><span class="line-number">138</span><br><span class="line-number">139</span><br><span class="line-number">140</span><br><span class="line-number">141</span><br><span class="line-number">142</span><br><span class="line-number">143</span><br><span class="line-number">144</span><br><span class="line-number">145</span><br><span class="line-number">146</span><br><span class="line-number">147</span><br><span class="line-number">148</span><br><span class="line-number">149</span><br><span class="line-number">150</span><br><span class="line-number">151</span><br><span class="line-number">152</span><br><span class="line-number">153</span><br><span class="line-number">154</span><br><span class="line-number">155</span><br><span class="line-number">156</span><br><span class="line-number">157</span><br><span class="line-number">158</span><br><span class="line-number">159</span><br><span class="line-number">160</span><br><span class="line-number">161</span><br><span class="line-number">162</span><br><span class="line-number">163</span><br><span class="line-number">164</span><br><span class="line-number">165</span><br><span class="line-number">166</span><br><span class="line-number">167</span><br><span class="line-number">168</span><br><span class="line-number">169</span><br><span class="line-number">170</span><br><span class="line-number">171</span><br><span class="line-number">172</span><br><span class="line-number">173</span><br><span class="line-number">174</span><br><span class="line-number">175</span><br><span class="line-number">176</span><br><span class="line-number">177</span><br><span class="line-number">178</span><br><span class="line-number">179</span><br><span class="line-number">180</span><br></div></div><p>2、在mode设置为none下，添加配置</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code>module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
  mode<span class="token operator">:</span> <span class="token string">'none'</span><span class="token punctuation">,</span>
  plugins<span class="token operator">:</span> <span class="token punctuation">[</span>
    <span class="token comment">// webpack3需要添加这个</span>
    <span class="token keyword">new</span> <span class="token class-name">webpack<span class="token punctuation">.</span>optimize<span class="token punctuation">.</span>ModuleConcatenationPlugin</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">/******/</span> <span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">modules</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// webpackBootstrap</span>
<span class="token comment">/******/</span> 	<span class="token comment">// install a JSONP callback for chunk loading</span>
<span class="token comment">/******/</span> 	<span class="token keyword">function</span> <span class="token function">webpackJsonpCallback</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 		<span class="token keyword">var</span> chunkIds <span class="token operator">=</span> data<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 		<span class="token keyword">var</span> moreModules <span class="token operator">=</span> data<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 		<span class="token keyword">var</span> executeModules <span class="token operator">=</span> data<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 		<span class="token comment">// add &quot;moreModules&quot; to the modules object,</span>
<span class="token comment">/******/</span> 		<span class="token comment">// then flag all &quot;chunkIds&quot; as loaded and fire callback</span>
<span class="token comment">/******/</span> 		<span class="token keyword">var</span> moduleId<span class="token punctuation">,</span> chunkId<span class="token punctuation">,</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> resolves <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 		<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token punctuation">;</span>i <span class="token operator">&lt;</span> chunkIds<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 			chunkId <span class="token operator">=</span> chunkIds<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 			<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">hasOwnProperty</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>installedChunks<span class="token punctuation">,</span> chunkId<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> installedChunks<span class="token punctuation">[</span>chunkId<span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 				resolves<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>installedChunks<span class="token punctuation">[</span>chunkId<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 			<span class="token punctuation">}</span>
<span class="token comment">/******/</span> 			installedChunks<span class="token punctuation">[</span>chunkId<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 		<span class="token punctuation">}</span>
<span class="token comment">/******/</span> 		<span class="token keyword">for</span><span class="token punctuation">(</span>moduleId <span class="token keyword">in</span> moreModules<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 			<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">hasOwnProperty</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>moreModules<span class="token punctuation">,</span> moduleId<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 				modules<span class="token punctuation">[</span>moduleId<span class="token punctuation">]</span> <span class="token operator">=</span> moreModules<span class="token punctuation">[</span>moduleId<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 			<span class="token punctuation">}</span>
<span class="token comment">/******/</span> 		<span class="token punctuation">}</span>
<span class="token comment">/******/</span> 		<span class="token keyword">if</span><span class="token punctuation">(</span>parentJsonpFunction<span class="token punctuation">)</span> <span class="token function">parentJsonpFunction</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 		<span class="token keyword">while</span><span class="token punctuation">(</span>resolves<span class="token punctuation">.</span>length<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 			resolves<span class="token punctuation">.</span><span class="token function">shift</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 		<span class="token punctuation">}</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 		<span class="token comment">// add entry modules from loaded chunk to deferred list</span>
<span class="token comment">/******/</span> 		deferredModules<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>deferredModules<span class="token punctuation">,</span> executeModules <span class="token operator">||</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 		<span class="token comment">// run deferred modules when all chunks ready</span>
<span class="token comment">/******/</span> 		<span class="token keyword">return</span> <span class="token function">checkDeferredModules</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 	<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 	<span class="token keyword">function</span> <span class="token function">checkDeferredModules</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 		<span class="token keyword">var</span> result<span class="token punctuation">;</span>
<span class="token comment">/******/</span> 		<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> deferredModules<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 			<span class="token keyword">var</span> deferredModule <span class="token operator">=</span> deferredModules<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 			<span class="token keyword">var</span> fulfilled <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 			<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">var</span> j <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> j <span class="token operator">&lt;</span> deferredModule<span class="token punctuation">.</span>length<span class="token punctuation">;</span> j<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 				<span class="token keyword">var</span> depId <span class="token operator">=</span> deferredModule<span class="token punctuation">[</span>j<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 				<span class="token keyword">if</span><span class="token punctuation">(</span>installedChunks<span class="token punctuation">[</span>depId<span class="token punctuation">]</span> <span class="token operator">!==</span> <span class="token number">0</span><span class="token punctuation">)</span> fulfilled <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 			<span class="token punctuation">}</span>
<span class="token comment">/******/</span> 			<span class="token keyword">if</span><span class="token punctuation">(</span>fulfilled<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 				deferredModules<span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">(</span>i<span class="token operator">--</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 				result <span class="token operator">=</span> <span class="token function">__webpack_require__</span><span class="token punctuation">(</span>__webpack_require__<span class="token punctuation">.</span>s <span class="token operator">=</span> deferredModule<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span> 			<span class="token punctuation">}</span>
<span class="token comment">/******/</span> 		<span class="token punctuation">}</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 		<span class="token keyword">return</span> result<span class="token punctuation">;</span>
<span class="token comment">/******/</span> 	<span class="token punctuation">}</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 	<span class="token comment">// The module cache</span>
<span class="token comment">/******/</span> 	<span class="token keyword">var</span> installedModules <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 	<span class="token comment">// object to store loaded and loading chunks</span>
<span class="token comment">/******/</span> 	<span class="token comment">// undefined = chunk not loaded, null = chunk preloaded/prefetched</span>
<span class="token comment">/******/</span> 	<span class="token comment">// Promise = chunk loading, 0 = chunk loaded</span>
<span class="token comment">/******/</span> 	<span class="token keyword">var</span> installedChunks <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 		<span class="token number">2</span><span class="token operator">:</span> <span class="token number">0</span>
<span class="token comment">/******/</span> 	<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 	<span class="token keyword">var</span> deferredModules <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 	<span class="token comment">// The require function</span>
<span class="token comment">/******/</span> 	<span class="token keyword">function</span> <span class="token function">__webpack_require__</span><span class="token punctuation">(</span><span class="token parameter">moduleId</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 		<span class="token comment">// Check if module is in cache</span>
<span class="token comment">/******/</span> 		<span class="token keyword">if</span><span class="token punctuation">(</span>installedModules<span class="token punctuation">[</span>moduleId<span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 			<span class="token keyword">return</span> installedModules<span class="token punctuation">[</span>moduleId<span class="token punctuation">]</span><span class="token punctuation">.</span>exports<span class="token punctuation">;</span>
<span class="token comment">/******/</span> 		<span class="token punctuation">}</span>
<span class="token comment">/******/</span> 		<span class="token comment">// Create a new module (and put it into the cache)</span>
<span class="token comment">/******/</span> 		<span class="token keyword">var</span> module <span class="token operator">=</span> installedModules<span class="token punctuation">[</span>moduleId<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">/******/</span> 			i<span class="token operator">:</span> moduleId<span class="token punctuation">,</span>
<span class="token comment">/******/</span> 			l<span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token comment">/******/</span> 			exports<span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
<span class="token comment">/******/</span> 		<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span>
<span class="token comment">/******/</span> 		<span class="token comment">// Execute the module function</span>
<span class="token comment">/******/</span> 		modules<span class="token punctuation">[</span>moduleId<span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>module<span class="token punctuation">.</span>exports<span class="token punctuation">,</span> module<span class="token punctuation">,</span> module<span class="token punctuation">.</span>exports<span class="token punctuation">,</span> __webpack_require__<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">/******/</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span 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class="line-number">175</span><br><span class="line-number">176</span><br><span class="line-number">177</span><br><span class="line-number">178</span><br><span class="line-number">179</span><br></div></div></div></div> <div class="page-edit"><div class="tags"><a href="/blogs/tags/?tag=webpack" title="标签">#webpack</a></div> <div class="last-updated"><span class="prefix">最近更新时间：</span> <span class="time">2021/02/05 19:00:38</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/blogs/column-notes/play-webpack/563c6c6524e1a/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">webpack进阶篇（二十一）：Tree Shaking的使用和原理分析</div></a> <a href="/blogs/column-notes/play-webpack/9a3e868717ada/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">webpack进阶篇（二十三）：代码分割和动态import</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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    </a></div> <div class="article-wrapper"><dl><dd>01</dd> <dt><div><a href="/blogs/golang/book-notes/the-way-to-go/b451871c7ebf3/"><div>总结和增强</div></a></div> <div class="date"><span>2021/03/16 19:29:10</span></div></dt></dl><dl><dd>02</dd> <dt><div><a href="/blogs/golang/book-notes/the-way-to-go/af1d6a84a8f0c/"><div>使用代理缓存</div></a></div> <div class="date"><span>2021/03/16 19:28:46</span></div></dt></dl><dl><dd>03</dd> <dt><div><a href="/blogs/golang/book-notes/the-way-to-go/49b0f32997236/"><div>版本 5 - 分布式程序</div></a></div> <div class="date"><span>2021/03/16 19:28:23</span></div></dt></dl> <div class="more-box"><a href="/blogs/archives/" class="more"><i class="fas fa-angle-double-right"></i>前往更多 ...
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